Disazo-dyestuffs insoluble in water



United States Patent *Oil'ice I Patented. Dec. 19, 1863 3,113,937 Dll-SAZG-DYESTUFFS ENSSLUBLE IN WATER Her-hart Nahaten, Bad Soden, Taunus, and Eoachirn Rihha, (itienoach (Mfnn), Germany, assignors to Farhwerirc Hoechst Airtieugesellschait vorrnals Nr'eister Lucius Eriining, Frankfurt am Main, Germany, a corporation of Germany No Drawing. Filed July 19, 196i Ser. No, 43,729 Claims priority, application Germany duly 2d, 1959 6 63mins. (Cl. 260-178) The present invention relates to new disazo-dyestufis insoluble in Water, more particularly it relates to dyestuffs which correspond to the following general formula RN=ILT IL=NR in which X represents hydrogen, a halogen atom, an alkyl or allroxy group, Y represents a radical of the benzene or diphenyl series and it stands for a radical of Z-hydroxynaphthalene-3carboxylic acid, Z-hydroxynaphthalene-Zicarboxylic acid amide or Z-hydroxynaph-thalene's-carboxylic acid arylamide.

We have found that valuable disazodyestufis insoluble in water are obtained by coupling a tetrazonium compound from an amine of the general formula in which X represents hydrogen, a halogen atom, an alltyl or allioxy group and Y represents a radical of the benzene or diphenyl series, with 2-hydroxynaphthalene-3-carboxylic acid, 2-hydroXynaphthalene-3-carboxylic acid amide or a Z-hydroxynaphthsalene-S-carboxylic acid-arylamide.

l N II N I The diamino compounds used in the present invention can be prepared by known methods, for example, by condensing S-nitro-benzoic acid, 3-nitro-benzoic acid halides or their derivatives substituted in the 4-positio-n, with 1,4-diamino-benzenes or 4,4'-diamino-diphenyls and subsequently reducing the nitro compounds so obtained. in addition to 3-nitro-benzoic acid, for example 3nitro-4- chloro-benzoic acid, 3-nitro-4-methoxy-benzoic acid or 3-nitro-4-rne'thyl-benzoic acid can also be used for :the condensation with the diamines. As diamines there can be used, for example, l,4-diarnino-benzene, 4,4'-diarninodiphenyl, 4,4-dlamino 3,3 dimethoxydiphenyl, 4,4'-diamino-3,3-dimethyldiphenyl or 4,4-diamino-3,3-dichlorodiphenyl.

As coupling components there can be used in the present invention 2-hydroxynaphthalene-3-carboxylic acid, Z-hydroxy-naphthalene-S-carboxylic acid amide, Z-hydroxy- 2 naphthalene-B-carboxylic acid phenylarnide and its derivatives substituted in the phenyl radical by halogen atoms, alkyl or alltoxy groups, furthermore Z-hydroxynaphthalene-3-carboxylic acid naphthylamides which are free from groups imparting solubility in Water, such as, for instance, carboxylic acid or sulfonic acid groups.

The dyestuffs are prepared by known methods, for example, by coupling the tetrazotized diamines with the coupling components in an aqueous solution in the pres ence of a dispersing agent.

The new dyestuffs are wateninsoluble pigments which are distin uished by a very good iastness to solvents. They are especially suitable for coloring lacquers and thermoplastic masses and also for pigment printing.

The following examples serve to illustrate the invention but they are not intended to limit it thereto, the parts being by Weight unless otherwise stated and the relationship of parts by weight to parts by volume being the same as that of the kilogram to the liter.

Example 1 41.5 parts of l,4-di-(3'-amino-4-chlorobenzoylamino)- benzene are stirred into 560 parts by volume of glacial acetic acid and parts by volume of 5 N-hydrochloric acid and the whole is tetrazotized by adding 40 parts by volume of a 5 N-sodium nitrite solution. The tetrazo solution so obtained is diluted with water to 4000 parts by volume, clarified and combined with an aqueous suspension of 60 parts of l-(2,3'-hydroxynaphthoylamino)- Z-methoxybenzene that had been prepared by dissolving this compound in diluted sodium hydroxide solution and reprecipitating it with glacial acetic acid in the presence of a reaction product of about 20 mols of ethylene oxide with 1 mol of octodecyl alcohol.

When the coupling is complete, the separated dyestuif is filtered off with suction, washed and dried. It is an orange powder. The dyestuii corresponds with the following formula II N 0 CH3 OH 0 CH3 Nitro cellulose lacquers prepared with the dyestuif give a red lacquering which possesses a very good fastness to overspraying. When incorporated into polyvinylchloride a red coloration of very good fastness to bleeding is obtained.

Example 2 8.65 parts of l,4-di-(3-arnino-benzoylamino)-benzene are stirred for severd hours in 30 parts by volume of 5 N-hydrochloric acid and 30 parts by volume of water, the whole is diluted with water and tetrazotized at room temperature with 10 parts by volume of a 5 N-sodium nitrite solution.

As described in Example 1, the clarified tetrazo solution is combined with an aqueous suspension of 15 parts of l-(2,3hydroxynaphthoylamino) -2 methoxybenzene. When the coupling is complete, the separated dyestuff is 4. The water-insoluble disazo-dyestuff which corresponds to the formula CONH OCH:

5. The water-insoluble disazo-dyestufi which corresponds to the formula H O-NHO-OCH;

6. The waterdnsoluble disazo-dyestufi which corresponds to the formula OCH:

OCH;

References Cited in the file of this patent UNITED STATES PATENTS 

1. WATER-INSOLUBLE DISAZO-DYESTUFFS WHICH CORRESPOND TO THE GENERAL FORMULA 